HT27C020
OTP CMOS 256K
8-Bit EPROM
Block Diagram
Features
Operating voltage: +5.0V
Programming voltage
V
PP
=12.5V
0.2V
V
CC
=6.0V
0.2V
High-reliability CMOS technology
Latch-up immunity to 100mA from -1.0V to
V
CC
+1.0V
CMOS and TTL compatible I/O
Low power consumption
Active: 30mA max.
Standby: 1
A typ.
256K
8-bit organization
Fast read access time: -70ns, -90ns
and -120ns
Fast programming algorithm
Programming time 75
s typ.
Two line controls (OE and CE)
Standard product identification code
Package type
32-pin DIP/SOP
32-pin PLCC
Commercial temperature range
(0
C to +70
C)
General Description
The HT27C020 chip family is a low-power,
2048K (2,097,152) bit, +5V electrically one-time
programmable (OTP) read-only memories
(EPROM). Organized into 256K words with 8
bits per word, it features a fast single address
location programming, typically at 75
s per
byte. Any byte can be accessed in less than
70ns/90ns/120ns with respect to Spec. This
eliminates the need for WAIT states in high-
performance microprocessor systems. The
HT27C020 has separate Output Enable (OE)
and Chip Enable (CE) controls which eliminate
bus contention issues.
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10th May '99
Pin Assignment
Pin Description
Pin Name
I/O/C/P
Description
A0~A17
I
Address inputs
DQ0~DQ7
I/O
Data inputs/outputs
CE
C
Chip enable
OE
C
Output enable
PGM
C
Program strobe
NC
--
No connection
VPP
P
Program voltage supply
VCC
I
Positive power supply
VSS
I
Negative power supply
HT27C020
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10th May '99
Absolute Maximum Rating
Operation Temperature Commercial ..................................................................................0
C to +70
C
Storage Temperature........................................................................................................ 65
C to 125
C
Applied VCC Voltage with Respect to VSS ....................................................................... 0.6V to 7.0V
Applied Voltage on Input Pin with Respect to VSS.......................................................... 0.6V to 7.0V
Applied Voltage on Output Pin with Respect to VSS.............................................. 0.6V to V
CC
+0.5V
Applied Voltage on A9 Pin with Respect to VSS ............................................................ 0.6V to 13.5V
Applied VPP Voltage with Respect to VSS ...................................................................... 0.6V to 13.5V
Applied READ Voltage (Functionality is guaranteed between these limits) ............... +4.5V to +5.5V
Note: These are stress ratings only. Stresses exceeding the range specified under "Absolute Maxi-
mum Ratings" may cause substantial damage to the device. Functional operation of this device
at other conditions beyond those listed in the specification is not implied and prolonged
exposure to extreme conditions may affect device reliability.
D.C. Characteristics
Read operation
Symbol
Parameter
Test Conditions
Min. Typ.
Max.
Unit
V
CC
Conditions
V
OH
Output High Level
5V
I
OH
=0.4mA
2.4
--
--
V
V
OL
Output Low Level
5V
I
OL
=2.1mA
--
--
0.45
V
V
IH
Input High Level
5V
--
2.0
--
V
CC
+0.5
V
V
IL
Input Low Level
5V
--
0.3
--
0.8
V
I
LI
Input Leakage Current
5V
V
IN
=0 to 5.5V
5
--
5
A
I
LO
Output Leakage Current
5V
V
OUT
=0 to 5.5V
10
--
10
A
I
CC
VCC Active Current
5V
CE=V
IL
, f=5MHz,
I
OUT
=0mA
--
--
30
mA
I
SB1
Standby Current (CMOS)
5V
CE=V
CC
0.3V
--
1.0
10
A
I
SB2
Standby Current (TTL)
5V
CE=V
IH
--
--
1.0
mA
I
PP
VPP Read/Standby Current
5V
CE=OE=V
IL
, V
PP
=V
CC
--
--
100
A
HT27C020
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10th May '99
Programming operation
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
CC
Conditions
V
OH
Output High Level
6V
I
OH
=0.4mA
2.4
--
--
V
V
OL
Output Low Level
6V
I
OL
=2.1mA
--
--
0.45
V
V
IH
Input High Level
6V
--
0.7V
CC
--
V
CC
+0.5
V
V
IL
Input Low Level
6V
--
0.5
--
0.8
V
I
LI
Input Load Current
6V
V
IN
=V
IL
, V
IH
--
--
5.0
A
V
H
A9 Product ID Voltage
6V
--
11.5
--
12.5
V
I
CC
VCC Supply Current
6V
--
--
--
40
mA
I
PP
VPP Supply Current
6V
CE=V
IL
--
--
10
mA
Capacitance
Symbol
Parameter
Test Conditions
Min. Typ. Max. Unit
V
CC
Conditions
C
IN
Input Capacitance
5V
V
IN
=0V
--
8
12
pF
C
OUT
Output Capacitance
5V
V
OUT
=0V
--
8
12
pF
C
VPP
VPP
Capacitance
5V
V
PP
=0V
--
18
25
pF
A.C. Characteristics
Read operation
Symbol
Parameter
Test Conditions
70
90
120
Unit
V
CC
Conditions Min. Max. Min. Max. Min. Max.
t
ACC
Address to Output Delay
5V
CE=OE=V
IL
--
70
--
90
--
120
ns
t
CE
Chip Enable to Output
Delay
5V
OE=V
IL
--
70
--
90
--
120
ns
t
OE
Output Enable to Output
Delay
5V
CE=V
IL
--
30
--
35
--
40
ns
t
DF
CE or OE High to Output
Float, Whichever
Occurred First
5V
--
--
25
--
25
--
30
ns
t
OH
Output Hold from
Address, CE or OE,
Whichever Occurred First
5V
--
0
--
0
--
0
--
ns
HT27C020
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10th May '99
Programming operation
Ta=+25
C
5
C
Symbol
Parameter
Test Conditions
Min. Typ. Max. Unit
V
CC
Conditions
t
AS
Address Setup Time
6V
--
2
--
--
s
t
OES
OE Setup Time
6V
--
2
--
--
s
t
DS
Data Setup Time
6V
--
2
--
--
s
t
AH
Address Hold Time
6V
--
0
--
--
s
t
DH
Data Hold Time
6V
--
2
--
--
s
t
DFP
Output Enable to Output Float
Delay
6V
--
0
--
130
ns
t
VPS
VPP Setup Time
6V
--
2
--
--
s
t
PW
PGM Program Pulse Width
6V
--
30
75
105
s
t
VCS
VCC Setup Time
6V
--
2
--
--
s
t
CES
CE Setup Time
6V
--
2
--
--
ns
t
OE
Data Valid from OE
6V
--
--
--
150
s
t
PRT
VPP Pulse Rise Time During
Programming
6V
--
2
--
--
s
Test waveforms and measurements
For -70, -90, -120 devices:
Output test load
t
R
, t
F
< 20ns (10% to 90%)
Note: C
L
=100pF including jig capacitance, except for the
-45 devices, where C
L
=30pF.
HT27C020
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10th May '99
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